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Chemistry 1991 WAEC Past Questions

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6

Which of the processes represented by the following equations has the greatest positive entropy change?

  • A. C6H3(l) → C6H 6 (g)
  • B. H2O (s) → H2O(l)
  • C. CuO(s) + H2(g) → Cu(s) + H2
  • D. Na2CO3(s) + nH2O(l) →Na 2CO3nH2O(s)
  • E. S(s) → S(l)
View Answer & Discuss (1) WAEC 1991
7
Which of the following elements can from more than one acidic oxide?
  • A. Hydrogen
  • B. Sulphur
  • C. Carbon
  • D. Alumium
  • E. Iron
View Answer & Discuss WAEC 1991
8
CH2 = CH2 + H2SO4 → CH3 - CH2 -OSO3H. The reaction illustrated by the equation above is an example of
  • A. substitution
  • B. oxidation
  • C. reduction
  • D. addition
  • E. displacement
View Answer & Discuss (3) WAEC 1991
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9
Brass is an alloy of copper and
  • A. iron
  • B. chromium
  • C. zinc
  • D. tin
  • E. magnesium
View Answer & Discuss (2) WAEC 1991
10
Which of the following formula is that of a dicarboxylic acid?
  • A. (CH3CH 2)2CHCOOH
  • B. CH2(OH)2
  • C. CH3CH(OH)COOH
  • D. CH2(COOH)2
  • E. CH3COCOOH
View Answer & Discuss WAEC 1991
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